Summary of Significant Accounting Policies - Summary of Quantitative Inputs and Assumptions Used for Items Categorized in Level 3 of Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value	$ 964,075	$ 218,225
Unobservable Inputs	977,219	$ 216,929
Fair Value, Recurring Basis | Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value	$ 485,406